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Very bright MASTER unusual OT, detected during SWIFT GRB150413A

ATel #7381; E. Gorbovskoy, V. Lipunov, N. Tiurina, P. Balanutsa, V. Kornilov, S. Antipin, V. Chazov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, SAI), O. Gress, K. Ivanov, N. Budnev, S. Yazev, V. Poleschuk (Irkutsk State University), D. Buckley, S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station)
on 13 Apr 2015; 15:49 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Gamma Ray, Request for Observations, Gamma-Ray Burst, Transient

Referred to by ATel #: 7387, 7391

MASTER OT J124141.98+715028.0 - GRB150413A OT

MASTER-Tunka auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 12 41 41.98 +71 50 27.99 on 2015-04-13 13:58:41.897 during Swift GRB150413A(GCN17689) alert observations.

OT unfiltered magnitude at 2015-04-13 14h:00min:21.581s is m_OT=16.0 (GCN17689 , GCN17690 ).

1.5 hour after trigger time MASTER OT J124141.98+715028.0 is still about 16m (unfiltered, w=0.2B+0.8R , USNO-B1 calibrated)

There is no object in any catalog at this position.

The discovery image is available at http://master.sai.msu.ru/static/OT/grb150413A.jpg

Follow up spectral and photometrical observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net